Chicken Sulfur like smell

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Chicken Sulfur like smell

I know that a bit of a sulfur smell seems to be normal but last night I opened up a pack of chicken breast I bought from a local producer from the farmer's market and it was more than just a bit of a sulfur smell. Is this normal? The strength of the smell did disipate somewhat after a few minutes but it was still quite strong. The chicken was pre packaged in a vacuum packed plastic with a best beofre date of July 3rd. The chicken itself seemed fine (it wasn't slimy and it didn't have any of those white creamy lines forming when it starts to go bad). I went ahead and marinaded the chicken. Should I be concerned?